Suppose you believe that Apple's stock price is going to increase from its current level of $ 63.98 sometime during the next 5 months. For $ 500.70 you could buy a 5-month call option giving you the right to buy 100 shares at a price of $ 77 per share. If you bought a 100-share contract for $ 500.70 and Apple's stock price actually changed to $ 81.98 at the end of 5 months, and after behaving economically rationally on your decision to exercise the option, your net profit (or loss) would be ______